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Simplifying 7(x + -3) + 4x = 7x + -21 Reorder the terms: 7(-3 + x) + 4x = 7x + -21 (-3 * 7 + x * 7) + 4x = 7x + -21 (-21 + 7x) + 4x = 7x + -21 Combine like terms: 7x + 4x = 11x -21 + 11x = 7x + -21 Reorder the terms: -21 + 11x = -21 + 7x Add '21' to each side of the equation. -21 + 21 + 11x = -21 + 21 + 7x Combine like terms: -21 + 21 = 0 0 + 11x = -21 + 21 + 7x 11x = -21 + 21 + 7x Combine like terms: -21 + 21 = 0 11x = 0 + 7x 11x = 7x Solving 11x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 11x + -7x = 7x + -7x Combine like terms: 11x + -7x = 4x 4x = 7x + -7x Combine like terms: 7x + -7x = 0 4x = 0 Divide each side by '4'. x = 0 Simplifying x = 0
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